Do I need the GTW-08 module to use this template?

Yes. The Diematic Evolution does not expose Modbus RTU natively. The GTW-08 addon module must be installed in the wall cabinet to enable Modbus communication.

What baud rate should I configure on the gateway?

The default baud rate is 9600 with 8 data bits, 1 stop bit, and no parity. Make sure both the GTW-08 and the ModbusCloud gateway use the same serial settings.

Can I write setpoints and modes, or is the template read-only?

Many registers in this template are both readable and writable. You can change zone modes, room setpoints, hot water temperature targets, and heating curve parameters directly from the cloud.

I see no data after wiring. What should I check?

Confirm the Modbus slave address on the GTW-08 matches the address configured in ModbusCloud. Also verify the A and B wires are not swapped and that the RS-485 bus is properly terminated.

Free Modbus template: DeDietrich Diematic Evolution

Name: DeDietrich Diematic Evolution
Brand: DeDietrich
SKU: a5b3a440-73a4-4c34-b7a3-df43b888086c

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Free Modbus template: DeDietrich Diematic Evolution | ModbusCloud

Registers (69)

63 read / 37 write

Name	Address	Function	Type	Unit	Access
273_FlowTempRec Flow temperature of the unit	273	FC03	int16	°C	R
274_ReturnTempRec Return temperature of the unit	274	FC03	int16	°C	R
275_ProducerManagerStatusBitfieldReceived Producer Manager Status Bitfield Received	275	FC03	uint16		R
276_ProducerManagerRequestReceived Producer Manager Request Received	276	FC03	uint16		R
279_ApplianceStatus1 Appliance status 1	279	FC03	uint16		R
280_ApplianceStatus2 Appliance status 2	280	FC03	uint16		R
384_ApTOutside Outdoor temperature measurement	384	FC03	int16	°C	R
385_ApSeasonMode Seasonal mode active	385	FC03	uint16		R
400_ApTflow Flow temperature	400	FC03	int16	°C	R
401_ApTreturn Return temperature_	401	FC03	int16	°C	R
403_HpHeatPumpTF Flow temperature of the heat pump	403	FC03	int16	°C	R
404_HpHeatPumpTR Return temperature of the heat pump_	404	FC03	int16	°C	R
409_ApWaterPressure_ Actual water pressure	409	FC03	uint16	bar	R
389_ApForceSummerMode Force Summer Mode	389	FC03	uint16		R/W
1108_ZoneCurrentMode Mode of operation mode of operation of the zone	1108	FC03	uint16		R
278_Appliance Error Priority Appliance Error Priority	278	FC03	uint16		R
502_parApCoolingEnabled Defines the type of cooling used	502	FC03	uint16		R/W
661_parZoneAmbiantCoolingNightSetpoint Room temperature setpoint for switching from Comfort to Reduced	661	FC03	uint16	°C	R/W
676_parZoneHCZPN 8-1 Base temperature of the curve in Reduced mode	676	FC03	uint16	°C	R/W
677_parZoneMaxPreHeatTime Maximum time for preheating time	677	FC03	uint16	min	R/W
687_parZonePumpPostRun Post-operational delay of the zone pump	687	FC03	uint16	min	R/W
688_parZoneTimeProgramSelected User-selected time programme the user	688	FC03	uint16		R/W
1620_Current zone mode: Current zone mode:	1620	FC04	uint16		R
503_ApCoolingForced Manually forces the heat pump into cooling mode cooling mode	503	FC03	uint16		R/W
531_varApplianceOnError Presence of an error on the device	531	FC03	uint16		R
533_ErroPriority1 Severity level of the error of the device located_	533	FC03	uint16		R
641_parZoneFunction Function of the zone	641	FC03	uint16		R
649_parZoneMode Zone operating mode_	649	FC03	uint16		R/W
650_parZoneRoomUserActivitySetpoint1 User activity temperature setpoint per zone	650	FC03	uint16	°C	R/W
651_parZoneRoomUserActivitySetpoint2 User activity temperature setpoint per zone	651	FC03	uint16	°C	R/W
655_parZoneAmbiantNightSetpoint Room temperature setpoint for switching from Comfort to Reduced	655	FC03	uint16	°C	R/W
656_parZoneRoomCoolingSetpoint1 User activity room temperature setpoint per zone in cooling mode (NIGHT)	656	FC03	uint16	°C	R/W
657_parZoneRoomCoolingSetpoint2 User activity room temperature setpoint per zone in cooling mode (HOME)	657	FC03	uint16	°C	R/W
662_parZoneAmbiantHolidaySetpoint Temperature temperature desired for the Holiday period of the the zone	662	FC03	uint16	°C	R/W
664_parZoneRoomManualSetpoint Room temperature setpoint adjusted manually desired for the zone	664	FC03	uint16	°C	R/W
671_parZoneHeatingControlStrategy Control strategies	671	FC03	uint16		R/W
672_parZoneTFlowSetpointMax Temperature flow temperature maximum flow temperature zone	672	FC03	uint16	°C	R/W
673_parZoneTFlowCoolingMixingSetpoint Temperature required during cooling	673	FC03	uint16	°C	R/W
674_parZoneSlope Slope of the heating curve heating curve of the zone	674	FC03	uint16		R/W
675_parZoneHCZPD 8-1 Base temperature of the curve in Comfort mode	675	FC03	uint16	°C	R/W
1102_varZoneTRoomSetpoint 8-1 Current temperature setpoint temperature required room temperature	1102	FC03	uint16	°C	R
1179_Required Hot Water Temperature (Holiday) Required Hot Water Temperature (Holiday)	1179	FC04	uint16	°C	R/W
1180_Required Hot Water Temperature for Antilegionella Required Hot Water Temperature for Antilegionella	1180	FC04	uint16	°C	R/W
1184_Maximum temperature Hot Water Maximum temperature Hot Water	1184	FC04	uint16	°C	R/W
1200_Time program selected for Hot Water Time program selected for Hot Water	1200	FC04	uint16		R/W
1619_Current zone activity: Current zone activity:	1619	FC04	uint16		R
1103_varZoneTOutside 8-1 Outside Temperature of the zone	1103	FC03	uint16	°C	R
1104_varZoneTRoom 8-1 Temperature current room temperature of the zone	1104	FC03	uint16	°C	R
1107_varZoneCurrentActivities Current activity in the active area	1107	FC03	uint16		R
1161_Hot water operating mode Hot water operating mode	1161	FC04	uint16		R/W
1177_Required Hot Water Temperature (Comfort) Required Hot Water Temperature (Comfort)	1177	FC04	uint16	°C	R/W
1178_Required Hot Water Temperature (Reduced) Required Hot Water Temperature (Reduced)	1178	FC04	uint16	°C	R/W
410_varApFlowmeter 8 -1 Flow rate	410	FC03	uint16	l/min	R
411_varApStatus Status of the device	411	FC03	uint16		R
412_varApSubStatus Sub-state of the device	412	FC03	uint16		R
406_varChSetpoint 8 -1 Central heating setpoint of the appliance	406	FC03	uint16	°C	R
405_varApInternalSetpoint 8 -1 Internal setpoint used for hot water production water production	405	FC03	uint16	°C	R
407_varHpCoolingSetpoint 8 -1 Flow temperature setpoint in cooling mode cooling mode	407	FC03	uint16	°C	R
388_parApFrostMinToutside Anti-Freeze	388	FC03	uint16	°C	R/W
387_parApNeutralBandSummerWinter Neutral Band Summer_Winter	387	FC03	uint16	°C	R/W
386_parApSummerWinter Outdoor temperature: upper heating limit	386	FC03	uint16	°C	R/W
1631 - Hot water temperature (lower sensor) Hot water temperature (lower sensor)	1631	FC04	uint16	°C	R
1632 - Hot water temperature (upper sensor) Hot water temperature (upper sensor)	1632	FC04	uint16	°C	R
256_PowerSetpoint Power setpoint of the cooling demand to be sent to the to be sent to the control unit	256	FC06	uint16	W	W
257_TemperatureSetpoint Temperature setpoint of the cooling demand to be sent to the to be sent to the control unit	257	FC06	uint16	°C	W
258_AlgoritthmType Type of regulation	258	FC06	uint16		W
259_HeatDemandtype Heat Demand type	259	FC06	uint16		W
500_parApChEnabled allows the central heating demand to be processed_	500	FC05	uint16		W
501_parApDhwEnabled Enables the demand for domestic hot water production to be processed hot water production_	501	FC05	uint16		W

DeDietrich Diematic Evolution

Overview

Key readings

Available commands

Use cases

Installation

Things to watch for

Registers (69)

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